1 files changed, 19 insertions, 0 deletions
diff --git a/src/test/ui/unboxed-closures/unboxed-closures-infer-fnmut-calling-fnmut.rs b/src/test/ui/unboxed-closures/unboxed-closures-infer-fnmut-calling-fnmut.rs
new file mode 100644
index 000000000..73f488a4f
--- /dev/null
+++ b/src/test/ui/unboxed-closures/unboxed-closures-infer-fnmut-calling-fnmut.rs
@@ -0,0 +1,19 @@
+// run-pass
+// Test that we are able to infer a suitable kind for this closure
+// that is just called (`FnMut`).
+
+fn main() {
+    let mut counter = 0;
+
+    {
+        // Here this must be inferred to FnMut so that it can mutate counter:
+        let mut tick1 = || counter += 1;
+
+        // In turn, tick2 must be inferred to FnMut so that it can call tick1:
+        let mut tick2 = || { tick1(); tick1(); };
+
+        tick2();
+    }
+
+    assert_eq!(counter, 2);
+}